For years, we economists have claimed to have a miracle cure for heavy traffic. It’s “congestion pricing”: Charge drivers more to use roads and bridges during the busiest times, and clogged roadways will clear up overnight.

Now, at last, technology can make that miracle a reality.

With apps, GPS and other tools, roadway officials can track traffic and set prices in real time. Then drivers will get updates about traffic conditions and costs—letting them decide as they travel if they want to pay more to take a crowd…
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